Toner is a powder used in laser printers and photocopiers to form the printed text and images on the paper, in general with a toner cartridge. In its early form it was a mix of carbon powder and iron oxide. Then, to improve the quality of the printout, the carbon was melt-mixed with a polymer.”

What kind of printer uses toner?
“Inkjet printers use liquid ink sprayed through microscopic nozzles onto the paper, and laser printers use a toner cartridge (filled with fine powder) and a heated fuser. Each technology has its own strenghths and weaknesses.”

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